linux-kernel - [PATCH AUTOSEL 6.10 02/34] drm/amd/display: Handle HPD

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Message-ID: <20240728154230.2046786-2-sashal@kernel.org>
Date: Sun, 28 Jul 2024 11:40:26 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Sung-huai Wang <danny.wang@....com>,
	Robin Chen <robin.chen@....com>,
	Aurabindo Pillai <aurabindo.pillai@....com>,
	Daniel Wheeler <daniel.wheeler@....com>,
	Alex Deucher <alexander.deucher@....com>,
	Sasha Levin <sashal@...nel.org>,
	harry.wentland@....com,
	sunpeng.li@....com,
	Rodrigo.Siqueira@....com,
	christian.koenig@....com,
	Xinhui.Pan@....com,
	airlied@...il.com,
	daniel@...ll.ch,
	hersenxs.wu@....com,
	dennis.chan@....com,
	alex.hung@....com,
	hamza.mahfooz@....com,
	chuntao.tso@....com,
	george.shen@....com,
	Bhawanpreet.Lakha@....com,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.10 02/34] drm/amd/display: Handle HPD_IRQ for internal link

From: Sung-huai Wang <danny.wang@....com>

[ Upstream commit 239b31bd5c3fef3698440bf6436b2068c6bb08a3 ]

[Why]
TCON data is corrupted after electro static discharge test.
Once the TCON data get corrupted, they will get themselves
reset and send HPD_IRQ to source side.

[How]
Support HPD_IRQ for internal link, and restore the PSR/Replay setup.

Reviewed-by: Robin Chen <robin.chen@....com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@....com>
Signed-off-by: Sung-huai Wang <danny.wang@....com>
Tested-by: Daniel Wheeler <daniel.wheeler@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 .../dc/link/protocols/link_dp_irq_handler.c   | 25 ++++++++++++-------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_irq_handler.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_irq_handler.c
index 0fcf0b8530acf..659b8064d3618 100644
--- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_irq_handler.c
+++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_irq_handler.c
@@ -373,6 +373,7 @@ bool dp_handle_hpd_rx_irq(struct dc_link *link,
 	union device_service_irq device_service_clear = {0};
 	enum dc_status result;
 	bool status = false;
+	bool allow_active = false;
 
 	if (out_link_loss)
 		*out_link_loss = false;
@@ -427,12 +428,6 @@ bool dp_handle_hpd_rx_irq(struct dc_link *link,
 		return false;
 	}
 
-	if (handle_hpd_irq_psr_sink(link))
-		/* PSR-related error was detected and handled */
-		return true;
-
-	handle_hpd_irq_replay_sink(link);
-
 	/* If PSR-related error handled, Main link may be off,
 	 * so do not handle as a normal sink status change interrupt.
 	 */
@@ -454,9 +449,8 @@ bool dp_handle_hpd_rx_irq(struct dc_link *link,
 	 * If we got sink count changed it means
 	 * Downstream port status changed,
 	 * then DM should call DC to do the detection.
-	 * NOTE: Do not handle link loss on eDP since it is internal link*/
-	if ((link->connector_signal != SIGNAL_TYPE_EDP) &&
-			dp_parse_link_loss_status(
+	 */
+	if (dp_parse_link_loss_status(
 					link,
 					&hpd_irq_dpcd_data)) {
 		/* Connectivity log: link loss */
@@ -465,6 +459,11 @@ bool dp_handle_hpd_rx_irq(struct dc_link *link,
 					sizeof(hpd_irq_dpcd_data),
 					"Status: ");
 
+		if (link->psr_settings.psr_feature_enabled)
+			edp_set_psr_allow_active(link, &allow_active, true, false, NULL);
+		else if (link->replay_settings.replay_allow_active)
+			edp_set_replay_allow_active(link, &allow_active, true, false, NULL);
+
 		if (defer_handling && has_left_work)
 			*has_left_work = true;
 		else
@@ -477,6 +476,14 @@ bool dp_handle_hpd_rx_irq(struct dc_link *link,
 		dp_trace_link_loss_increment(link);
 	}
 
+	if (*out_link_loss == false) {
+		if (handle_hpd_irq_psr_sink(link))
+			/* PSR-related error was detected and handled */
+			return true;
+
+		handle_hpd_irq_replay_sink(link);
+	}
+
 	if (link->type == dc_connection_sst_branch &&
 		hpd_irq_dpcd_data.bytes.sink_cnt.bits.SINK_COUNT
 			!= link->dpcd_sink_count)
-- 
2.43.0